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Christophe Basso

Senior Scientist
Christophe Basso is an Application Engineering Director at ON Semiconductor in Toulouse, France, where he leads an application team dedicated to developing new offline PWM controller specifications. He has originated numerous integrated circuits among which the NCP120X series has set new standards for low standby power converters.

Further to his 2008 book “Switch-Mode Power Supplies: SPICE Simulations and Practical Designs”, published by McGraw-Hill, he released a new title in 2012 with Artech House, “Designing Control Loops for Linear and Switching Power Supplies: a Tutorial Guide”. He holds 30 patents on power conversion and often publishes papers in conferences and trade magazines including How2Power and PET.

Christophe has over 20 years of power supply industry experience. Prior to joining ON Semiconductor in 1999, Christophe was an application engineer at Motorola Semiconductor in Toulouse. Before 1997, he worked as a power supply designer at the European Synchrotron Radiation Facility in Grenoble, France, for 10 years. He holds a BSEE equivalent from the Montpellier University (France) and a MSEE from the Institut National Polytechnique of Toulouse (France). He is an IEEE Senior member.

Linear Circuit Transfer Function : An Introduction to Fast Analytical Techniques 

by Christophe Basso - 2016-06-01 09:36:21.0

"Linear Circuit Transfer Function : An Introduction to Fast Analytical Techniques" is a book recently published by Wiley in the IEEE-press imprint and authored by Christophe Basso, technical Fellow at ON Semiconductor. 

Chasing Losses in Low-Standby Power Designs 

by Christophe Basso - 2015-04-27 16:00:53.0

When operating a switching converter from the wall outlet, part of the absorbed energy feeds the load while the rest is lost and dissipated in heat. To get an idea of the loss amount in a given application – assume a set-top box adapter – simply place your hand on the cover while it operates and feel the heat: a warm enclosure implies significant losses while a cold case (no pun intended) characterizes a highly-efficient power supply. If you now press the standby button, you expect the box to cool down after several minutes. However, in some cases, you can still feel a warm enclosure, telling you that losses still exist despite standby.

Voltage Drops Also Affect the Forward Converter DC Transfer Function 

by Christophe Basso - 2014-12-08 13:26:51.0

In a previous blog post, we have seen how parasitic terms found in passive components such as capacitors and inductors can affect the transfer function of a switching converter. Actually, all losses, whether they are coming from passive elements (equivalent series resistances [ESR]) or from active parts (diodes forward drops, dynamic resistances, MOSFET rDS(on) and so on) affect the converter transfer function. For instance, in dc, the inductor ESR, the diode forward drop and the MOSFET rDS(on) affect the control-to-output transfer function: you ideally calculate a duty ratio for a given operating point but experiments on the board show a different value that can potentially evolve with temperature. The ac transfer function is also affected by various loss mechanisms. Permanent losses such as capacitor and inductor ESR surely affect efficiency, but diode reverse recovery time, magnetic losses and MOSFET switching losses dissipate energy and tend to lower the converter quality factor. Theory points out a peaky response and laboratory experiments show a rather flat curve.

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